NEW YORK (AdAge.com) -- NBC Univeral's digital broadcasting strategies for the Beijing Olympics won wide acclaim throughout the marketing and media industries. And the mastermind of it all was chief digital officer George Kliavkoff. Last month, he announced he was leaving NBC to join an unnamed entrepreneurial venture. Yesterday, he was on stage at a New York Media Information Exchange Group (MIEG) breakfast event at the Samsung Experience at Time Warner Center.